A Centrifugal Compressor Vaneless Diffuser Stability Expansion System

Abstract

The invention relates to a stabilizing system for a bladeless diffuser of a centrifugal compressor. In the stabilization system, return channels with openings at both ends are provided on the inner wall of the vaneless diffuser, and the return channels are arranged in a straight line along the radial direction of the vaneless diffuser. There are several return passages, and several return passages are arranged along the circumferential direction of the vaneless diffuser; dynamic pressure sensors are also provided in the present invention, and the distribution of the dynamic pressure sensors in the circumferential direction of the vaneless diffuser is related to the distribution of the return passages. The distribution of the dynamic pressure sensor in the radial direction of the vaneless diffuser includes at least two positions of the return inlet and the return outlet of the return passage. There is an opening and closing device in the return channel, and the controller can individually control the opening and closing device in any return channel. The invention realizes the active and intelligent expansion and stability of the vaneless diffuser without affecting the performance and efficiency of the compressor under the design working condition through the active intelligent control mode.

Description

technical field [0001] The invention belongs to the technical field of compressors, in particular to a bladeless diffuser expansion and stabilization system for a centrifugal compressor. Background technique [0002] Centrifugal compressors are widely used in petrochemical, metallurgy, air-conditioning, automobile and other fields due to their advantages such as high pressure ratio, large flow rate and simple structure. With the development of production, in recent years, higher requirements have been put forward for the stable operation and expansion technology of compressors. One of the key factors affecting the stable operating range of the compressor is the rotating stall and surge under low flow conditions. These unstable flow phenomena will deteriorate the performance of the compressor, further causing vibration and damage to the impeller and other components, resulting in shutdown or even major damage. ACCIDENT. The diffuser is the most common critical component for...

AI Technical Summary

Problems solved by technology

However, the stability expansion technology in the prior art is often aimed at the vane diffuser, and the rotating stall mechanism of the vaneless diffuser is very different from that of the vane diffuser; The structural improvement of the compressor will affect the internal flow of the compressor under the original stable working condition, resulting in a decrease in the performance and efficiency of the compressor

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